KR101942044B1 - Apparatus and method for processing signal of dynamic boost audio - Google Patents

Abstract

An apparatus for processing a dynamic boost audio signal according to an embodiment of the present invention includes: a signal (volume) level sensing unit for sensing a signal (volume) level of an audio signal; A filter unit for filtering a specific band of the audio signal; A boost gain generation unit for generating a boost gain (amplification ratio) according to the signal (volume) level; A signal size adjuster for adjusting a signal size of a band filtered by the filter to a boost gain to generate a compensation signal; And a mixer unit for mixing the audio signal and the compensation signals of the signal size adjustment unit.

Description

TECHNICAL FIELD [0001] The present invention relates to a dynamic boost audio signal processing apparatus and a dynamic boost audio signal processing method,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an audio signal processing apparatus, and more particularly, to a dynamic boost audio signal processing apparatus and method for improving a sound quality of an audio signal by boosting a specific band signal in consideration of loudness characteristics of the ear .

Physically measured sound pressure (or sound intensity) never matches the actual perceived sound volume through the human auditory organ. And, the human ear has an irregular response characteristic to the sound of the audible frequency.

For example, the sensitivity is very high for sounds of 200 Hz to 2 kHz, while the sensitivity is insensitive for frequencies below or below that.

Such a graph of human auditory characteristics is called an Equal Loudness Curve or an isometric curve (see FIG. 1).

Referring to the graph of FIG. 1, as the volume of the human ear is lower, there is a loudness characteristic in which the bass and treble bands are not heard well.

Therefore, due to the human auditory characteristics, the audio apparatus requires a process of boosting the bass and treble bands and compensating for the loudness characteristics of the ear as the loudness becomes smaller.

Conventionally, a specific frequency band signal is simply added to the original signal to boost a specific frequency band, or a degree of adding a signal of a specific frequency band is set in a volume level set by the user, (Boost).

However, when a specific frequency band signal is simply added to the original signal to boost a specific frequency band, there is a disadvantage in that distortion can be caused due to the output limit level at a large volume. In addition, There is a problem that an accurate amount of boost is not set according to the magnitude of the original signal to be input.

Japanese Patent Application Laid-Open No. 10-2018-0042590

An object of the present invention is to provide an apparatus and a method for processing a dynamic boost audio signal that varies the degree of boosting of a specific band signal according to a signal level.

According to an aspect of the present invention, there is provided an apparatus for processing a dynamic boost audio signal, the apparatus including: a signal level detector for detecting a level of an audio signal; A filter unit for filtering a specific band of the audio signal; A boost gain generation unit for generating a boost gain (amplification ratio) according to the signal (volume) level; A signal size adjuster for adjusting a signal size of a band filtered by the filter to a boost gain to generate a compensation signal; And a mixer unit for mixing the audio signal and the compensation signals of the signal size adjustment unit.

According to an aspect of the present invention, there is provided a method of processing a dynamic boost audio signal, the method comprising: sensing a volume level of an audio signal; A filtering step of filtering a specific band of the audio signal; A boost gain generation step of generating a boost gain (amplification ratio) according to the signal (volume) level; A compensation signal generation step of generating a compensation signal by adjusting a signal amplitude of the filtered band to a boost gain; And a mixing step of mixing the audio signal and the compensation signal.

Therefore, by using the apparatus and method for processing a dynamic boost audio signal according to an embodiment of the present invention, a signal (volume) level of an audio signal is automatically detected, and when the size of the audio signal is small, ), And when the size of the signal is large, bass and treble are boosted to a small extent to compensate for the loudness characteristic of the ear to improve the sound quality of the audio.

Fig. 1 is an illustration showing an isometric curve. Fig.
2 is a diagram illustrating a structure of a dynamic boost audio signal processing apparatus according to an embodiment of the present invention.
3 is an exemplary view of the filter portion shown in Fig.
4 is a graph showing the change in the boost gain depending on the magnitude of the signal (volume) level.
5 is a flowchart of a method of processing a dynamic boost audio signal according to an embodiment of the present invention.

Hereinafter, an apparatus and a method for processing a dynamic boost audio signal according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a diagram illustrating a structure of an apparatus for processing a dynamic boosted audio signal according to an embodiment of the present invention, FIG. 3 is an example of a filter unit shown in FIG. 2, FIG. 5 is a graph showing a change in boost gain. FIG.

1, the dynamic boost audio signal processing apparatus 100 of the present invention boosts a low frequency band (less than 200 Hz frequency band) and a higher frequency band (more than 2 KHz frequency band) of an audio signal, The present invention relates to an apparatus for compensating for sound quality of a low-frequency band and a high-frequency band in accordance with the characteristics of an audio signal, When it is high, it is the device which wants to boost the bass and treble small.

More specifically, the dynamic boost audio signal processing apparatus 100 includes a signal (volume) level sensing unit 110, a filter unit 120, a boost gain generation unit 130, a signal size adjustment unit 140, (150).

The signal (volume) level sensing unit 110 senses a signal (volume) level of the audio signal.

The filter unit 120 filters at least one of a low-frequency band and a high-frequency band of the audio signal.

Here, the low frequency band may be less than 200 Hz, and the high frequency band may be a frequency band exceeding 2 KHz.

Meanwhile, the filter unit 120 may be configured in various forms.

First, the filter unit 120 may include at least one band-pass filter that passes only a low-frequency band and a high-frequency band.

Alternatively, the filter unit 120 may include a low-pass filter unit configured to filter a low-frequency band, the plurality of unit filters configured in series or in parallel, and a high-pass filter unit configured to filter a high- Or at least one.

Next, the boost gain generator 130 generates a boost gain (amplification ratio) according to the signal level of the audio signal. The boost gain (amplification ratio) can be determined through a gain slope as shown in FIG.

The boost gain generation unit 130 may divide the low frequency band and the high frequency band into a plurality of bands and separately boost the bands.

The boost gain generator 130 may be boosted by giving a weight to the magnitude of the signal passing through the unit filter.

The boost gain generated by the boost gain generator 130 generates a boost gain that is linearly reduced from the low level to the high level of the signal level.

Also, the boost gain generator 130 may generate different boost gains according to the low and high frequency bands.

The boost gain (amplification ratio) is set so that the boost gain is attenuated as the signal (volume) level becomes larger, and can be set so that the boost gain (amplification ratio) becomes "0" above the threshold level. That is, the boost gain (amplification ratio) increases as the signal level becomes smaller, and the degree of increase can be adjusted and is set so as not to increase any more when the limit boost gain is greater than or equal to the limit boost gain.

Next, the signal size adjusting unit 140 adjusts the signal size of the band filtered by the filter unit 120 according to the boost gain and outputs a compensation signal.

Next, the mixer unit 150 mixes the audio signal and the compensation signals of the signal size adjustment unit 140.

5 is a flowchart of a method of processing a dynamic boost audio signal according to an embodiment of the present invention.

Referring to FIG. 5, a dynamic boost audio signal processing method (S700) according to an embodiment of the present invention may be performed through the apparatus shown in FIG.

First, a signal (volume) level of an audio signal is sensed at a signal (volume) level sensing unit 110 (S710), and at least one band of a low and a high sound bands of the audio signal input from the filter unit 120 is filtered (S720). Here, the low frequency band may be less than 200 Hz, and the high frequency band may be a frequency band exceeding 2 KHz.

The filter unit 120 may be configured in various forms. For example, a band pass filter (BPF) that passes only a low-frequency band and a high-frequency band, or a low-pass filter unit (Low) that filters a low- A pass filter (LPF) 121, and a high pass filter (HPF) 122 that filters a high frequency band in which a plurality of unit filters are connected in series or in parallel.

Next, the boost gain generator 130 generates a boost gain (amplification ratio) according to the level of the signal (volume) (S730).

The step S730 may include weighting the signal passing through the unit filter of the filter unit 120 and boosting the signal.

Referring to FIG. 4, the boost gain (amplification ratio) is set so that the boost gain is attenuated as the signal (volume) level becomes larger and is set so that the boost gain (amplification ratio) .

That is, the boost gain (amplification ratio) increases as the signal level becomes smaller, and the degree of increase can be adjusted and is set so as not to increase any more when the limit boost gain is greater than or equal to the limit boost gain.

Next, the signal size adjusting unit 140 generates a compensation signal by adjusting the signal size of the band filtered by the filter unit 120 according to the boost gain (S740), and outputs the compensation signal to the audio signal input from the mixer unit 150 And mixes the compensation signals of the signal size adjustment unit 140 (S750).

Therefore, when the dynamic boost audio signal processing apparatus according to an embodiment of the present invention is used, the size of the audio signal is automatically detected, and when the size of the audio signal is small, a lot of bass and treble are boosted, The sound quality of the audio can be improved by compensating the bass and treble for a small boost to match the loudness characteristic of the ear.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention.

100: Dynamic boost audio signal processing device
110: signal (volume) level sensing unit
120:
121: Low pass filter section
122: high pass filter section
130: Boost gain generator
140:
150: Mixer section

Claims (7)

A signal (volume) level sensing unit for sensing a signal (volume) level of an audio signal;
A filter unit for filtering a specific band of the audio signal by at least one unit filter;
A boost gain generation unit for generating a boost gain (amplification ratio) according to the signal (volume) level;
A signal size adjuster for adjusting a signal size of a band filtered by the filter to a boost gain to generate a compensation signal; And
And a mixer unit for mixing the audio signal and the compensation signals of the signal size adjustment unit,
Wherein the boost gain generator applies a weight according to the unit filter to generate a boost gain that is inversely proportional to the signal level. The method according to claim 1,
The filter unit
Wherein the at least one unit filter is configured in series or in parallel. delete delete A signal (volume) level sensing step of sensing a signal (volume) level of an audio signal;
A filtering step of filtering a specific band of the audio signal by at least one unit filter;
A boost gain generation step of generating a boost gain (amplification ratio) according to the signal (volume) level;
A compensation signal generation step of generating a compensation signal by adjusting a signal amplitude of the filtered band to a boost gain; And
And a mixing step of mixing the audio signal and the compensation signal,
Wherein the step of generating the boost gain is a step of generating a boost gain in inverse proportion to the level of the signal (loudness) for each band by applying a weight according to the unit filter. delete delete

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